We propose a technique where we measure the
real S-matrix of the array/subject setup in-situ and then closely match it in simulation using circuit
co-simulation with a modified cost function. We show that by accurately
simulating coupling, the B1+ and thus the SAR can be better predicted using
FDTD simulations. Better pTx SAR predictions will ensure RF safety while
reducing the overly conservative pTx SAR predictions that are used currently.

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